Herein, we demonstrate a three-dimensional (3D) nanoporous (NP) structure, resulting from electrochemical alloying/dealloying of polycrystalline Au in a mixture of ethylene glycol and 1.5 M ZnCl₂, for the efficient electrochemical reduction of CO₂ to CO. The formed NP Au-Zn was further thermally treated with H₂SO₄, whereupon a significant enhancement of its electrocatalytic activity was achieved. The resulted NP Au exhibited over 65 times higher current density compared to a polycrystalline Au surface, and three times higher current density than NP Au-Zn at −0.6 V vs. RHE in a CO₂-saturated 0.1 M NaHCO₃ solution. In addition, the Faradaic efficiency (FE) of the formed NP Au at the applied potentials of −0.6 V for 10 h was extremely high (95.9%), revealing that the surface structure played a critical role in the electrochemical reduction of CO₂. The superior catalytic activity, high production rate, excellent FE, and high stability make the unique NP Au developed in this study a promising electrocatalyst for the efficient and selective conversion of CO₂ to CO.

在这里，我们展示了一种三维（3D）纳米孔（NP）结构，该结构是由乙二醇与1.5 M ZnCl ₂的混合物中多晶Au的电化学合金化/脱合金化而产生的，用于将CO ₂有效地电化学还原为CO。形成的NP Au-Zn进一步用H ₂ SO ₄进行热处理，从而显着提高了其电催化活性。在-0.6 V电压下，相对于RHE，在CO ₂饱和的0.1 M NaHCO _3中，所得的NP Au的电流密度是多晶Au表面的65倍，电流密度是NP Au-Zn的三倍。解决方案。此外，在-0.6 V的施加电势下10小时所形成的NP Au的法拉第效率（FE）极高（95.9％），表明表面结构在电化学还原CO _2中起着关键作用。优异的催化活性，高生产率，优异的FE和高稳定性使本研究开发的独特NP Au成为将CO ₂有效和选择性转化为CO的有前途的电催化剂。